leaflet.fullscreen VS core

Many people feel like "I'm not good enough for this project." The problem is people get the impression that project existed with final form. It can be difficult to dive into a project that has been developed over the years. You should spend weeks to understad that code repository. My practical suggestion is find a active small library like a map plugin. Build project. Look at all files try to understand them. When you get the pattern look at issues tab try to solve one of them. Here is an example only 335 line, weekly npm 8000+ https://github.com/brunob/leaflet.fullscreen/blob/master/Control.FullScreen.js

I have created an organisation on GitHub called jsenv to share what I have learnt about JS. For this reason my readmes are going into more details than usual readmes (at least I tried). If you are interested I recommend you to check https://github.com/jsenv/jsenv-core, it is meant to start JS projects from scratch for "beginners". Feel free to contact me if you are interested by what you see 😊

Give a chance to jsenv. I have built this tool exactly to author project in es6 targeting browsers and/or Node.js. You will get the dev server + test runner + build script (minification and so on) compatible with es6: https://github.com/jsenv/jsenv-core.